Shredder dust feeding facilities and reverberatory furnace provided with this feeding facilities

ABSTRACT

The present invention relates to facilities for feeding shredder dusts to a reverberatory furnace in which shredder dusts is fed to a reverberatory furnace for non-ferrous smelting, and in particular, to facilities for feeding shredder dusts to a reverberatory furnace in which a feeding chute that passes to the inside of the reverberatory furnace is fitted to the ceiling of the reverberatory furnace and shredder dusts can be fed from this feeding chute, and which also allows oxygen enriched air to be supplied to the feeding chute and fed to the inside of the reverberatory furnace. Further, the present invention relates to a reverberatory furnace for non-ferrous smelting in which a burner is able to be installed in a wall portion of one end side thereof, and in particular, to a reverberatory furnace for non-ferrous smelting in which a plurality of feeding ports to which are connected the feeding chutes of the shredder dusts feeding facilities are provided at the one end side in the ceiling portion thereof forming a plurality of staggered rows facing the other end side.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a feeding facilities forshredder dusts for performing an incinerating process by burningshredder dusts comprising various shredded waste materials by feedingthe shredder dusts to a reverberatory furnace for non-ferrous smeltingand to a reverberatory furnace provided with this feeding facilities.

[0003] 2. Description of the Related Art

[0004] In recent years the processing of industrial waste materials hasbecome a problem for society. Currently, the landfilling of wastematerials is severely restricted and incineration methods are alsoregulated so as to prevent dioxin from being generated. In thissituation, in order to recover various metals such as copper, gold,silver, and palladium without generating dioxin, the inventors of thepresent invention attempted the processing of automobile shredder dustsin a reverberatory furnace. Here, the term shredder dusts is used torefer generally to fluff materials coming out when scrapped vehicles arecrushed in order to recover steel and aluminum. Shredder dusts is moreeasily burnt than chipped tires and also contains valuable metals;therefore, the processing ratio of such attempts is continuallyimproving.

[0005] A schematic flow chart of the processing of automobile shredderdusts in a reverberatory furnace is shown in FIG. 9. In this flow chart,the reverberatory furnace 1 is a green charge type (wet charge type)reverberatory furnace used for non-ferrous smelting and in particularfor smelting copper concentrates. Industrial waste materials such asautomobile shredder dusts are stored in the stockyard 2, thentransported to the reverberatory furnace 1 by conveyors 4 from the feedhopper 3 and fed into the inside of the reverberatory furnace 1 by afeeding chute composed by such as a steel pipe. The industrial wastematerials are then processing in the reverberatory furnace 1 togetherwith copper concentrates. Oxygen enriched air is also supplied to thereverberatory furnace 1 from an oxygen plant 5.

[0006] Moreover, the off-gas from the reverberatory furnace 1 is cooledthrough a waste heat boiler 6 for recovering heat and, then the dust inthe off-gas has been collected by an electrostatic precipitator 7, SO₂in the gas is fixed as gypsum by a gypsum plant 8. Note that the steamgenerated in the waste heat boiler 6 is used to electrical power in aturbine generator 9, however, the amount of generated power correspondsto approximately half of the total amount of power consumption at thesmelter. On the other hand, in the period when the converter isoperating, dried copper concentrates and oxygen from the oxygen plant 5are fed into the converter 10 and the off-gas is fed to the sulfuricacid plant 13 via the boiler 11 and the electrostatic precipitator 12.Moreover, an anode produced from the converter 10 via an anode furnace14 is changed to electrolytic copper in a tank house (electro-refiningplant) 15. In this tank house 15, gold, silver, and palladium arecollected as anode slime.

[0007] As the present inventors were continuing the above describedattempts, they noticed that there were several problems that needed tobe resolved arising from the burning of shredder dusts in thereverberatory furnace 1 in the above described manner. One of theseproblems was that the amount of shredder dusts to be processed in thereverberatory furnace 1 was limited by the volume of off-gas expelledfrom the reverberatory furnace 1. Namely, if the atmosphere inside thereverberatory furnace 1 becomes insufficient in oxygen due to theoff-gas generated in the burning of the shredder dusts previouslysupplied or to the burning off-gases caused by fuel directly fed fromthe burner into the reverberatory furnace 1 and burnt therein, then evenif new shredder dusts is fed into the reverberatory furnace 1, thiscannot be easily burnt and simply accumulates in an unprocessed stateinside the reverberatory furnace 1.

[0008] Moreover, as described above, the shredder dusts is stored thestockyard 2 of the smelter, transported by the conveyor 4 from the feedhopper 3, then fed to the inside of the reverberatory furnace 1 via afeeding chute. However, for example, if the feeding chute is simplyinstalled in the ceiling of the reverberatory furnace 1 and the shredderdusts simply fed into this chute, the off-gases increase and in cases inwhich it is not possible to maintain a sufficient negative draft insidethe reverberatory furnace 1, there is the concern that the off-gasinside the furnace and the gas from the burning will leak out by thefeeding chute. Since the sealing needs to be so secure that the gasinside the furnace does not leak even when the shredder dusts is beingfed, it is necessary to provide a double damper, for example, whichresults, of course, in the operation of feeding the shredder dustsbecoming complicated, but also means that continuous feeding isdifficult. The ultimate result is that restrictions are placed on theamount of shredder dusts that can be processed.

[0009] Another problem is that if shredder dusts remains as unburntcondition when the shredder dusts is charged to the reverberatoryfurnace 1, this unburnt shredder dusts piles up in the reverberatoryfurnace 1 forming small hills (piles) in the furnace. If the dimensionof these piles increases, the clearance between them and the ceiling ofthe reverberating furnace 1 becomes smaller. As a result, when newshredder dusts is fed to the top of the pile, the hot-gas goes out ofthe reverberatory furnace 1 through the feeding chute positioneddirectly above the flames, creating the concern that the conveyor beltused for transporting the shredder dusts may be burnt. Moreover,particularly if these large piles are formed nearby the burners insidethe reverberatory furnace 1, then the burning condition of the burnersis disturbed which naturally results in the burning of the shredderdusts not being possible, and also results in the burner combustion heatnot being able to be used effectively for the melting of the copperconcentrates.

[0010] The present invention was achieved on the basis of thesecircumstances and it is an object thereof to provide an facilities forfeeding shredder dusts to a reverberatory furnace capable of securingthe sealing of a feeding chute when shredder dusts is fed to areverberatory furnace used for non-ferrous smelting as described aboveand for ensuring that the shredder dusts is burnt properly and therebyachieving an increase in the amount of this processing that can beperformed.

[0011] In addition, a further aim of the present invention is to providea reverberatory furnace in which the formation of large piles thereverberatory furnace caused by unburnt of shredder dusts is prevented,and in which the blocking of the propagation of burning heat from theburner is prevented, and also in which hot gas is prevented from leakingfrom inside the furnace.

SUMMARY OF THE INVENTION

[0012] In order to solve the above problems and achieve these objects,the structure described below has been employed in the presentinvention. Namely, the present invention relates to facilities forfeeding shredder dusts to a reverberatory furnace in which shredderdusts is fed to a reverberatory furnace for non-ferrous smelting, and inparticular, to facilities for feeding shredder dusts to a reverberatoryfurnace in which a feeding chute that passes to the inside of thereverberatory furnace is fitted to the ceiling of the reverberatoryfurnace and shredder dusts can be fed from this feeding chute, and whichalso allows oxygen enriched air to be supplied to the feeding chute andfed to the inside of the reverberatory furnace.

[0013] In this case, the feeding chute is branched partway along itslength and it is desirable that the shredder dusts is fed from one endthereof while the oxygen enriched air is supplied in from the other endthereof.

[0014] It is also desirable that an air supply nozzle that has a smallerdiameter than the feeding chute is inserted in the other end of thebranched feeding pipe and the distal end of the air supply nozzle ispositioned adjacent to the branched portion of the feeding chute andthat the oxygen enriched air is supplied in from the air supply nozzle.

[0015] Furthermore, the present invention relates to a reverberatoryfurnace for non-ferrous smelting provided with the shredder dust feedingfacilities, and in particular, to a reverberatory furnace fornon-ferrous smelting in which a burner is able to be installed in a wallportion of one end side thereof and a plurality of feeding ports towhich are connected the feeding chutes of the shredder dusts feedingfacilities are provided at the one end side at a ceiling portion forminga plurality of staggered rows facing another end side.

[0016] In this case, it is desirable that, in the ceiling portion, theone end side where the feeding ports are provided is raised above theother end side.

[0017] Moreover, it is desirable that a feeding chute of the feedingfacilities is connected to each one of the plurality of feeding portsand the positions at which shredder dusts is fed to the feeding hoppersare arranged in a single row.

BRIEF DESCRIPTION OF THE DRAWINGS

[0018]FIG. 1 is a plan view showing the schematic structure of areverberatory furnace according to the present invention.

[0019]FIG. 2 is a side view as seen from the direction of the arrow A inFIG. 1 showing the schematic structure of the feeding facilitiesaccording to the present invention.

[0020]FIG. 3 is a side cross sectional view showing in detail a portionof the reverberatory furnace according to the present invention.

[0021]FIG. 4 is a horizontal cross sectional view of the reverberatoryfurnace shown in FIG. 3 (wherein below the center line O shows the crosssection along the line B-B in FIG. 3).

[0022]FIG. 5 is a half sectional view taken along the line C-C in FIG.3.

[0023]FIG. 6 is a plan view showing in detail a portion of the feedingfacilities according to the present invention.

[0024]FIG. 7 is a cross sectional view taken along the line D-D in FIG.6.

[0025]FIG. 8 is a cross sectional view taken along the line E-E in FIG.6.

[0026]FIG. 9 is a flow chart for when shredder dusts is fed to areverberatory furnace used for smelting copper concentrates.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027]FIGS. 1 through 8 show an embodiment of the present invention. Inthis embodiment, the present invention is applied to a green charge type(wet charge type) of reverberatory furnace 21 used for smelting copperconcentrates. In the present embodiment, as is shown in FIG. 1,reverberatory furnaces 21 and 21 are provided in parallel and eightfeeding ports 22 . . . are provided in each ceiling portion 21 a of thereverberatory furnaces 21 and 21. As is shown in FIG. 2, a shredderdusts feeding facilities 23 is provided for each of the feeding ports 22. . . As is shown in FIG. 1 and in FIGS. 3 to 5, as seen in plan view,the reverberatory furnaces 21 are formed in a substantially elongatedschematic box shape and one end side in the longitudinal directionthereof (i.e. the bottom side in FIG. 1 and the right side in FIGS. 3and 4) is the side where the burner is provided. A plurality of windowportions 21 c for burner installation are formed in the wall portion 21b of the one end side in the longitudinal direction, and two waste heatboilers 24 and 24 are connected to each reverberatory furnace 21 at thewall portion 21 d of the other end side in the longitudinal direction(i.e. at the top side in FIG. 1 and the left side in FIGS. 3 and 4).Note that a plurality of unillustrated hoppers used for inserting copperconcentrates are provided at the burner side of the ceiling portions 21a of the reverberatory furnaces 21 in a line along the wall portions 21e and 21 e that extend in the longitudinal direction of thereverberatory furnace 21.

[0028] Approximately half of each ceiling portion 21 a of thereverberatory furnaces 21 at the one end side in the longitudinaldirection where the burner is situated is formed slightly raised abovethe other end side, as is shown in FIG. 3, and the above eight feedingports 22 . . . are provided at this raised portion at the one end side.These feeding ports 22 . . . are arranged in two rows as seen in planview in the vicinity of the center line O in the transverse direction ofthe reverberatory furnace 21 (i.e. in the horizontal direction in FIGS.1 and 5 and in the vertical direction in FIG. 4) such that the samenumber (four) thereof are placed on either side of this center line Oand in rows parallel thereto. In addition, the distance from each row offeeding ports 22A . . . and 22B . . . to the center line O is equal.

[0029] In addition, the four feeding ports 22A . . . and 22B . . . ineach row are arranged equidistantly in the direction of the center lineO, namely, in the aforementioned longitudinal direction. Moreover, thedistance between adjacent feeding ports 22 and 22 in the direction ofthe center line O is set equal to each other in the same row. Inaddition, the feeding ports of the other row are positioned at thecenter of adjacent feeding ports 22 and 22 in the direction of thecenter line of one row. Namely, the feeding ports 22A and the feedingports 22B are arranged so as to alternate in a staggered (i.e. zigzag)pattern along the direction of the center line O. Note that the portionof the ceiling portion 21 a where these feeding ports 22 . . . areprovided is constructed as a water cooled copper jacket.

[0030] As is shown in FIG. 2, the bottom ends of the feeding facilities23 provided for each of the feeding ports 22 . . . arranged in this wayare connected to the feeding ports 22 and open onto the inside of thereverberatory furnace 21. In addition, the feeding facilities 23 areprovided with feeding chute 25 that are provided at the ceiling portion21 a so as to extend vertically upwards. More specifically, as is shownin FIGS. 6 to 8, branch pipes 26 having the same diameter as the feedingchute 25 branch out extending in a diagonally upward direction frompartway along the vertically extending feeding chutes 25. In addition,air supply nozzles 27 having a smaller diameter than the feeding chutes25 are inserted coaxially with the feeding chutes 25 into the feedingchutes 25 from the top end thereof. Hoppers 28 are provided via a freelyremovable insertion damper at the top end portion of the branch pipes26, namely, at the position where shredder dusts is fed to the feedingchutes 25. At the top end portion of the feeding chutes 25 into whichthe air supply nozzles 27 are inserted, the peripheries of the airsupply nozzles 27 are sealed by lid bodies 29. An observation window 29a manufactured from heat resistant glass and an inspection opening 29 bthat is normally closed are provided in each lid body 29.

[0031] Here, as is shown in FIG. 7, in the feeding facilities 23A . . .attached to the four feeding ports 22A . . . forming the aforementionedone row from out of the feeding facilities 23 attached to the feedingports 22 . . . , short branch pipes 26 branch from a position in theupper end portion of the feeding chutes 25 diagonally upwards in adirection away from the center line O along a plane that intersects thecenter line O. In contrast, as is shown in FIG. 8, in the feedingfacilities 23B . . . attached to the feeding ports 22B . . . forming theother row and positioned on the opposite side of the center line O fromthe one row of feeding ports 22A . . . , long branch pipes 26 branchfrom a position in the bottom end portion of the feeding chutes 25diagonally upwards at a sloping angle equal to that of the above branchpipes 26 of the feeding facilities 23A along a plane that intersects thecenter line O. Furthermore, as seen in plan view, these branch pipes 26extend beyond the center line O to the side of the one feedingfacilities 23A . . . (note that, for this description, in FIG. 2, thesloping angles of the branch pipes 26 in both feeding facilities 23A and23B are shown as being different).

[0032] By making the length and the positions where the branch pipes 26branch from the feeding chutes 25 different, regardless of whether ornot the positions of the feeding ports 22A and 22B in the transversedirection in the feeding facilities 23A . . . and 23B . . . aredifferent, namely, regardless of whether or not the positions of thefeeding chutes 25 are different, the hoppers 28 are provided on astraight line parallel with the center line O such that the positions ofthe hoppers 28, namely, the positions at which the shredder dust is fedto the feeding chutes 25, have the same height and match each other inthe transverse direction, as is shown in FIG. 6. Furthermore, a shuttleconveyor 30 is provided extending parallel to the center line O directlyabove the hoppers 28 . . . of the feeding facilities 23A . . . and 23B .. . arranged thus in a straight line. As a result, when the insertiondampers are removed to the branch pipes 26, as is shown in FIG. 1, byloading the shredder dust that has been transported via the conveyorbelt 32 (corresponding to the conveyor belt 4 in FIG. 9) from the feedhopper 31 (corresponding to the feed hopper 3 in FIG. 9) into thehoppers 28 of each feed facilities 23 . . . from the shuttle conveyor30, it is possible to feed the shredder dust into the reverberatoryfurnace 21 through the feed chutes 25 via the branch pipes 26.

[0033] The bottom ends of the air supply nozzles 27 that are insertedinto the feed chutes 25 through the lid portions 29 from the top endportion of the feeding chutes 25 reach as far as the branch portion ofthe branch pipes 26 with the feeding chutes 25. Accordingly, in thefeeding facilities 23A in which the branch pipes 26 branch from the topend portion of the feeding chutes 25, while the insertion depth of theair supply nozzles 27 from the top end portion of the feeding chutes 25is shallow, in the feeding facilities 23 b in which the branch pipes 26branch from the bottom end portion of the feeding chutes 25, theinsertion depth of the air supply nozzles 27 is deep. In this case, thebottom ends of all of the air supply nozzles 27 are positionedsubstantially in the center in the vertical direction of the openingformed at the branch portion of the branch pipes 26 with the feedingchutes 25. In contrast, the top end portion of the air supply nozzles 27of each feeding facilities 23A . . . and 23B . . . are bent in ahorizontal direction at the point where they protrude from the lidbodies 29 and are then connected with larger diameter air supply pipes33. Each air supply pipe 33 is connected to an unillustrated oxygenenriched air supply source such as, for example, the oxygen plant 5shown in FIG. 9. Oxygen enriched air having a predetermined density andpressure is expelled from the air supply nozzles via the air supplypipes 33 and is able to be supplied into the reverberatory furnace 21together with shredder dust fed through the branch pipes 26. Note thatan operation floor 34 is placed at a distance above the ceiling portion21 a of the reverberatory furnace 21. In the present embodiment, theoperation floor 34 is provided with a water cooled plate to insulate itfrom the heat from the reverberatory furnace 21 and the top end portionsof the feeding chutes 25 and the branch pipes 26 protrude above thisoperation floor 34.

[0034] In the facilities 23 for feeding shredder dusts to thereverberatory furnace 21 having the structure described above, in orderto feed shredder dust that is inserted via the branch pipes 26 from thefeeding chutes installed via the feeding ports 22 in the ceiling portion21 a of the reverberatory furnace 21 together with oxygen enriched airsupplied in through the air supply nozzles 27 to the reverberatoryfurnace 21, the shredder dusts is inserted into the reverberatoryfurnace 21 while being burnt by the oxygen enriched air that is suppliedtogether with it. Accordingly, even if the atmosphere inside thereverberatory furnace 21 becomes insufficient in oxygen, it is possibleto ensure that the fed shredder dust is incinerated at a hightemperature. The result of this is that shredder dust from scrappedautomobiles and the like can be reliably processed without generatingharmful materials such as dioxin, and also that the heat from thecombustion can be used effectively for the smelting of (for examplecopper concentrates). Moreover, it is possible to suppress the actualformation of the aforementioned piles caused by unburnt shredder dust.

[0035] In addition, by feeding shredder dust together with oxygenenriched air to the inside of the reverberatory furnace 21 in this way,the feeding chutes 25 and the feeding ports 22 in the ceiling 21 a ofthe reverberatory furnace 21 to which the shredder dusts is fed can besealed by the pressure of the supplying of the oxygen enriched air.Accordingly, even if the furnace pressure inside the reverberatoryfurnace 21 changes and a sufficient negative pressure state cannot bemaintained inside the reverberatory furnace 21, it is possible toprevent the high temperature gas inside the reverberatory furnace 21from leaking from the feeding ports 22 through the feeding chutes 25. Asa result, without providing a double damper as in a conventional chutepipe, for example, it is possible to prevent a state in which theconveyor belt of the shuttle conveyor 30 is burned from occurring, and acontinuous feed of the shredder dusts becomes possible. Namely,according to the feeding facilities 23 having the above describedstructure, the sealing performance is secured and it is possible toreliably burn the shredder dusts and stable, efficient processing ofshredder dust can be promoted.

[0036] It should be noted that if oxygen enriched air and shredder dustsare fed in this way via the feeding chutes 25 to the interior of thereverberatory furnace 21, it is also possible to consider, for example,a means in which the branch pipes 26 as they are in the presentembodiment are not provided, and shredder dusts is fed to a single feedpipe and is then pressure supplied by oxygen enriched air. However, in ameans such as this, the risk of the shredder dusts becoming blockedinside this single feed pipe and the supply of the oxygen enriched airbeing obstructed and the oxygen enriched air then damaging the sealingperformance described above must be considered. In contrast to this, inthe feeding facilities 23 of the present embodiment, the branch pipes 26are provided branching off from partway along the feeding chutes 25 andshredder dusts is fed from these branch pipes 26 while oxygen enrichedair is supplied from the top end portion of the feeding chutes 25.Accordingly, even if the shredder dusts becomes blocked inside thebranch pipes 26, the supply of the oxygen enriched air is not cut offand, at the least, the sealing performance can be ensured due to theoxygen enriched air and it is possible to reliably prevent hightemperature gas from leaking from inside the reverberatory furnace 21.

[0037] Furthermore, in the feeding facilities 23 of the presentembodiment, when oxygen enriched air is supplied from the top endportion of the feeding chutes 25, the small diameter air supply nozzles27 are inserted into the feeding chutes 25 and the distal end (i.e. thebottom end) thereof is positioned at the connecting portion of thebranch pipes 26 with the feeding chutes 25, and oxygen enriched air issupplied from the air supply nozzles 27 at a predetermined pressure intothe feeding chutes 25 and fed into the reverberatory furnace 21.Accordingly, because the portions inside the branch pipes 26 where theyconnect to the feeding chutes 25 are placed in a negative pressurecondition by the oxygen enriched air supplied in via the air supplynozzles 27, the shredder dusts inserted into the branch pipes 26 fromthe hoppers 28 is fed by being sucked into the feeding chutes 25. As aresult, it is possible to prevent the shredder dusts from becomingblocked and to achieve a reliable and smooth feed of shredder dusts.

[0038] In addition, in the reverberatory furnace 21 of the presentembodiment, in the ceiling portion 21 a, the plurality of feeding ports22 in which the above feeding facilities 23 are provided are placed in astaggered arrangement running from the wall portion 21 b of thereverberatory furnace 21 in which the burners are placed in thelongitudinal direction of the reverberatory furnace 21, namely, in thedirection of the burning by the burners. As a result, it is possible toprevent the formation of the above described large piles inside thereverberatory furnace 21 and to prevent flames from escaping out fromthe feeding ports 22 . . . and the burning of the burner beingobstructed. Namely, by placing the feeding ports 22 . . . in a staggeredarrangement, the distance between each of the feeding ports 22 and 22 isincreased compared with if, for example, they were placed in a latticearrangement. Therefore, even if the piles are formed, they can beprevented from becoming too large. The result of this is that, asdescribed above, the gap to the ceiling 21 a is maintained and flamesare prevented from escaping. In addition, it is possible to spread theburning of the burner over the whole interior of the reverberatoryfurnace 21 (i.e. as far as the other side) and to melt the copperconcentrates, and also to effectively use the heat of the burning of thefed shredder dust.

[0039] Furthermore, in the reverberatory furnace 21 of the presentembodiment, the portion at one end side of the ceiling portion 21 a inthe longitudinal direction of the reverberatory furnace 21 where theburner is situated is formed slightly raised above the other end side,and the feeding ports 22 . . . are provided in a staggered arrangementin this raised portion. Accordingly, even if the above described pilesdo become formed, it is possible to ensure that a sufficient clearanceis maintained between the piles and the ceiling portion 21 a, therefore,it is possible to even more reliably prevent flames from leaking.

[0040] It should be noted that when the feeding ports 22 . . . arearranged in two rows in a staggered arrangement in this manner, if thefeeding chutes 25 . . . of the feeding facilities 23 . . . connected tothe feeding ports 22 . . . are only provided in the ceiling portion 21 aextending vertically, then the feed positions where shredder dusts isfed to these feeding pipes 25 . . . , namely, the positions of thehoppers 28 . . . also end up being arranged in two staggered rows.Accordingly, in order to insert the shredder dusts into this type ofhopper 28 . . . , it is necessary to provide two rows of shuttleconveyors for transporting the shredder dusts from the conveyor belt 32to a single reverberatory furnace 21.

[0041] In contrast, in the case of the reverberatory furnace 21 of thepresent embodiment, in the feeding facilities 23A . . . attached to thefeeding ports 22A . . . forming the one row parallel to the center lineO in the reverberatory furnace 21 from out of the feeding ports 22 . . .arranged in a staggered pattern, short branch pipes 26 branch from aposition in the upper end portion of the feeding pipes 25 while, in thefeeding facilities 23B . . . attached to the feeding ports 22B . . .forming the other row, long branch pipes 26 branch from a position inthe bottom end portion of the feeding chutes 25 parallel to the branchpipes 26 of the feeding facilities 23A. Furthermore, the top endpositions of the branch pipes 26 . . . to which the shredder dusts isfed match each other in height and in their positions in the transversedirection and a single row of the hoppers 28 . . . is provided at thetop end thereof. Accordingly, in this reverberatory furnace 21, thereonly needs to be a single row of the shuttle conveyor 30 for feeding theshredder dust from the hoppers 28 . . . to the feed chutes 25 . . . ofeach of the feed facilities 23A . . . and 23B . . . via the branch pipes26 . . . As a result, even if there are a plurality of rows of thefeeding ports 22 . . . arranged in a staggered pattern, there does notneed to be a plurality of rows of shuttle conveyors 30, which iseconomical as well as efficient.

[0042] Note that, in this reverberatory furnace 21, the feeding ports 22. . . are arranged in two rows in a staggered pattern, however, it isalso possible for the feeding ports 22 . . . to be arranged in three ormore rows in the above staggered pattern depending on the size and thelike of the reverberatory furnace 21. Moreover, in each row of thefeeding facilities 23A . . . and 23B . . . , instead of forming thebranch pipes 26 all at an equal slope angle branching out from differentpositions of the feeding chutes 25, as described above, it is possible,as is shown in FIG. 2, to provide branch pipes 26 having different slopeangles and to make both the branch position and the slope angledifferent. In these examples, in the same way as in the presentembodiment, it is also possible to make the positions (the positions ofthe hoppers 28 . . . in the present embodiment) from which the shredderdusts is fed to the feed chutes 25 . . . in one row.

What is claimed is:
 1. Facilities for feeding shredder dusts to areverberatory furnace in which shredder dusts is fed to a reverberatoryfurnace for non-ferrous smelting and is burned, wherein a feeding chutethat passes to the inside of the reverberatory furnace is fitted to aceiling of the reverberatory furnace and shredder dusts can be fed fromthe feeding pipe, and wherein oxygen enriched air can also be suppliedto the feeding nozzle and fed to the inside of the reverberatoryfurnace.
 2. The facilities for feeding shredder dusts according to claim1, wherein the feeding chute is branched partway along its length andthe shredder dusts is fed from one end of the branched pipe while theoxygen enriched air is supplied in from the other end of the branchedpipe.
 3. The facilities for feeding shredder dusts according to claim 1or 2, wherein an air supply nozzle that has a smaller diameter than thefeeding chute is inserted in the other end of the branched feeding chuteand the distal end of the air supply nozzle is positioned adjacent tothe branched portion of the feeding chute and the oxygen enriched air issupplied in from the air supply nozzle.
 4. A reverberatory furnace fornon-ferrous smelting provided with the shredder dusts feedingfacilities, wherein a burner is able to be installed in a wall portionof one end side of the reverberatory furnace and a plurality of feedingports to which are connected the feeding chutes of the shredder dustsfeeding facilities are provided at the one end side in a ceiling portionforming a plurality of staggered rows facing the other end side.
 5. Thereverberatory furnace according to claim 4, wherein in the ceilingportion, the one end side where the feeding ports are provided is raisedabove the other end side.
 6. The reverberatory furnace according toclaim 4 or 5, wherein a feed chute of the feed facilities is connectedto each one of the plurality of feeding ports and the positions at whichshredder dusts is fed to the feeding hoppers are arranged in a singlerow.